abstract_textpThe objective of this work was to develop softwares and hardwares applied to the management and automatic control for precision irrigation using center pivot systems. They were developed in the Rural Engineering Department-LER, at the "Luiz de Queiroz" College of Agriculture-ESALQ, of Sao Paulo University-USP, in Piracicaba, SP-Brazil. It was used discrete electronic components, several integrated circuits, radio frequency modules, microcontrollers from the Basic Step family and a microcomputer. The computer software was developed in Delphi language, and the Basic Step software was developed in Tbasic language. The hardware was constituted by two electronic circuits. The first circuit was developed as an interface to the computer and the second one for the management and transmission of tensiometers readings through radio frequency Evaluations of range and efficiency of the radio modules and performance of data transmission, of the software and hardware operations were carried out. The results showed that the circuits and the developed software operated satisfactorily. The reliable communication range of the radios is 50 meters maximum. In conclusion, the developed system presented great potential used in precision irrigation for center pivot systems, since the range of the radio communication could be increased./p/abstract_text
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